AMAT Endura Platform Setup & PVD Yield Optimization

The depth-optimized AMAT Endura machine can press the background vacuum to 10-9 Torr, completely eliminating target micro-arcing (Micro-arcing) and ensuring excellent step coverage (Step coverage) in ultra-high aspect ratio trenches. The reason why major fabs deploy the Endura platform by name is its dual-chamber ultra-high vacuum (UHV) architecture-this architecture can strictly isolate the wafer loading environment from the actual metal deposition process.

If many process teams use the thinking of CVD machine to make Endura, the yield will be shown to you in minutes. PVD (physical vapor deposition) is extremely sensitive to oxygen and water vapor in the background environment. Whether the internal condensate pump (Cryo pump) is not calibrated well, or the magnetron behind the sputtering target is misaligned, it will directly lead to macro-level metal peeling, interconnection layer holes (Voiding), and finally the whole chip will be scrapped directly.

If you want to fill up the yield of nodes below 2 nanometers, stop believing in the default software recipe (Recipe) that comes with the original factory (OEM). You have to use the V.M.P. yield architecture to refactor the hardware configuration and extract the extreme performance of the metal deposition production line.

V.M.P. Yield Architecture: The Ultimate Configuration Method For Endura

Senior equipment engineers in the factory are using this V.M.P. (vacuum vacuum, magnetron Magnetron, particulate matter Particle) architecture to systematically eliminate defects on the Endura platform. The rule is: first fix the hardware alignment, and then knock the chemical parameters of the process.

Vacuum integrity: the overwhelming advantage of a dual-chamber UHV

The reason why Endura can plate a metal film with extremely high purity depends on physical isolation. It uses a buffer Chamber (high vacuum environment) to drain the free moisture from the atmosphere, and then a transfer chamber (Transfer Chamber, ultra-high vacuum environment) to invert the wafers between the PVD process modules.

As long as the background vacuum drops to 10-7 Torr, oxygen atoms will directly drill into the Ta/TaN barrier layer, causing the square resistance (Rs) to take off in situ and the 2 nm interconnection layer to be scrapped on the spot. Therefore, you must fix the condensate pump to a baseline standard of 10-9 Torr for the transfer chamber. The residual gas analyzer (RGA) is used to do the leakage rate (ROR) test every day to catch the aging problem of the O-ring of the micro slit valve (Slit-valve) before the titanium or copper layer is oxidized.

Magnetron dynamics: squeezing target utilization to the extreme

Static magnetic field will make the target etching become potholed. The Endura platform is equipped with a rotating magnetron on the back of a high purity metal target. These running magnetic fields can deadlock the plasma (argon ions) in a narrow runway (Racetrack), greatly increasing the bombardment density.

If the speed of the magnetron is not set properly, the company’s real money will be wasted. If the rotation is too slow, the plasma will be concentrated in a specific groove, causing the target to “punch through” in advance (Punch-through)-the cooling water behind the target will directly explode into the vacuum chamber. You have to adjust the climbing curve and rotation algorithm of the direct current (DC) power supply to realize the full-face uniform erosion (Full-face erosion) of the target, which can not only stabilize the deposition rate, but also make the target life abruptly last from 10,000 kilowatt hours (kWh) to 10,005.

Particle Control: Baffle and Burn-In (Aging) Specification

Macro particles falling in the PVD process are the culprit that leads to fatal short circuits in adjacent copper connections. These particles are essentially metal skins peeled off from the shield inside the chamber.

The fab must install a heavily textured, arc-sprayed aluminum baffle in the process chamber. The rough surface can force the sputtered metal to “bite” on the cavity wall, preventing them from falling onto the wafer. The new target is 1 on the machine and immediately runs a set of extremely strict “Burn-in” (target burning/aging) procedures with the baffle (Dummy wafer). The DC power supply starts from 500 watts, and it takes 4 hours to slowly climb up, disk the surface of the target bit by bit, and drain all the oxides held inside.

2026 Technology Exchange: Back-Powered Network (BSPDN) Metallization

After the logic node approaches 2 nanometers, the power supply network must be moved to the back of the silicon chip (that is, the BSPDN architecture). This wave of architecture-level changes in 2026 directly makes the traditional copper (Cu) barrier layer-seed PVD process an antique in front of some nanoscale vias (Via).

At present, the Endura machine for BSPDN metallization is deposited with pure ruthenium (Ru) or molybdenum (Mo). In the past, when copper was used, a thick layer of tantalum nitride (TaN) had to be used as a barrier layer to prevent copper from scurrying into the silicon, but this would strangle the current in the extremely tiny through holes. Ruthenium, on the other hand, is both a conductor and a barrier.

However, the engineers who tuned Endura to sputter ruthenium are now suffering from internal film stress. Ruthenium inherently has extremely high tensile stress, which easily causes wafer warping (Bowing) or film peeling. To suppress this stress, you have to dig the argon pressure parameters and apply an extremely precise radio frequency (RF) substrate bias during deposition. This RF bias can drag the argon ions down, like a sledgehammer, hard the ruthenium atoms into a dense, low-stress lattice structure.

Insiders Are Also Easy To Step On The “Condensate Pump Trap”: Cross Contamination

It is not uncommon for machine maintenance technicians to waste the good Endura main engine because they ran the wrong regeneration (Regeneration) cycle of the condensate pump.

Condensate pumps rely on refrigeration to adsorb gases to maintain UHV. Once you are full, you have to heat up (regenerate) and discharge the lump of gas into the rough exhaust pipe.

The deadliest operation is coming: Some technicians forgot to close the slit valve (Slit valve) between the buffer chamber, transmission chamber and process chamber when doing local regeneration.

The end was extremely tragic: The water vapor and reactive gas originally sealed in the TiN cavity expanded violently when heated and poured directly into the spotless copper seed crystal (Cu Seed) cavity. The 300,000-dollar copper target was instantly contaminated with titanium nitride.

Remember that each chamber must be deadlocked with a software interlock (Interlock) before any thermal regeneration cycle is initiated. It is mandatory for your software engineers to completely lock the manual opening and closing authority of the slit valve under maintenance.

Field Case: Micro-Arc In Ta/TaN Barrier Etching

Background: A head logic factory encountered a yield loss of up to 12% when making 3nm through-hole metallization, which was all caused by unknown metal particle defects.

Investigation: 1 the OES (Optical Emission Spectroscopy) data of their Endura Ta/TaN cavity, they are all high-frequency micro-arcs (Micro-arcing). How did this thing come about? The insulating oxide piled up on the edge of the metal target, and the plasma hit the insulator, splitting a miniature lightning bolt on the spot, blasting chunks of tantalum slag directly onto the wafer.

Countermeasures: The engineering team decisively connected AMAT’s high-order pulsed DC (Pulsed DC) power supply. Instead of feeding a negative voltage to the target all the time, let the power supply hit a weak positive pulse of 10 microseconds.

Results: With this extremely short forward pulse, all the charges of the insulating oxide were discharged and the micro-arc disappeared instantly. The defect rate (D0) dropped by 95%, and the yield of the whole production line was brought back to life directly.

Defect Symptom	Root Cause	Endura Hardware Adjustment
Poor Step Coverage (Bottom of Trench)	Low Ion Directionality	Increase RF Wafer Bias; decrease chamber pressure.
Macro-particle Flaking	Shield Adhesion Failure	Replace smooth shields with arc-sprayed textured shields. Ensure Paste protocol is active.
Premature Target Punch-Through	Stalled Magnetron	Check magnetron motor assembly and calibrate rotation RPM.
High Film Resistivity (Oxidation)	UHV Vacuum Leak	Perform RGA helium leak check on O-rings and gas delivery lines.

Frequently Asked Technical Questions (FAQs)

What’s the difference between AMAT Endura and Centura?

Endura platform is specially customized for ultra-high vacuum (UHV)PVD process. The landmark design is its dual transmission chamber (buffer chamber + transmission chamber), which can tightly isolate the process module from the atmospheric environment. The Centura platform generally works in a lower vacuum range and uses a single transfer chamber design, which is mainly used to run CVD (chemical vapor deposition) and Etch (etching) processes.

What is the background vacuum of the Endura transmission chamber?

A well-maintained Endura transmission chamber is usually maintained at 10 ^-8 to 10 ^-9 Torr. This extreme vacuum is necessary to prevent the extremely reactive metal sputtering targets of titanium (Ti) and tantalum (Ta) from being oxidized by oxygen and water vapor.

Why does Endura have to use a condensate pump instead of a molecular pump (Turbo pump)?

The condensate pump freezes the gas directly in the ultra-low temperature array, so the speed of pumping water vapor (the biggest nemesis of PVD process) is exponential rolling molecular pump. After PM (preventive maintenance) is done on the machine, the pumping speed of the condensate pump must be relied on to pull the cavity back to the UHV vacuum level very quickly.

How to prevent target arc in Endura PVD cavity?

In order to prevent arc pulling, one must honestly run the strict target Burn-in (target burning) program (such as slow power climbing), use pulsed DC power supply to discharge the accumulated charge on the insulator, and finally strictly control the spacing between the target and the baffle (dark area Dark space) to prevent plasma from igniting where it should not be ignited.

What is the radio frequency base bias (RF substrate bias) used in Endura system?

The RF substrate bias is to apply the RF voltage directly to the electrostatic chuck (ESC) that holds the wafer. This bias makes the wafer negatively charged, dragging the positively charged argon ions down and bombarding the growing metal film. This ion bombardment makes the film denser, changes the intrinsic stress of the film, and also greatly improves the step coverage at the bottom of the deep.